I have not read one independent study of the current drone wars in Afghanistan, Pakistan and the horn of Africa that suggests these weapons serve any strategic purpose. Their "success" is expressed solely in body count, the number of so-called "al-Qaida-linked commanders" killed. If body count were victory, the Germans would have won Stalingrad and the Americans Vietnam.
Neither the legality nor the ethics of drone attacks bear examination. Last year's exhaustive report by lawyers from Stanford and New York universities concluded that they were in many cases illegal, killed civilians, and were militarily counter-productive. Among the deaths were an estimated 176 children. Such slaughter would have an infantry unit court-martialled. Air forces enjoy such prestige that civilian deaths are excused as a price worth paying for not jeopardising pilots' lives.